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The incident followed murderous strikes in Westminster and Manchester in March and May, and Ms Dick, whose policing career spans more than 30 years, said the flurry of attacks was "unprecedented in my working life".

It is to be expected, in the aftermath of such violence, that people will be more attuned to their surroundings.

Suspicious behaviour is, by its very nature, easy to confuse. There are instances, however, which, if you know what to look for, could indicate someone intends to cause harm, reports the Mirror.